A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish. 
-Which drawing best shows the approximate level of the mercury in the tube when the temperature of the entire apparatus is lowered from +20°C to -20°C?
Definitions:
Mean Squares
The average of the squares of the deviations or differences from the mean, often used in variance analysis.
Sum of Squares
A statistical measure used in regression analysis and ANOVA; it quantifies the total variance in the data by summing squared deviations from the mean.
Significance Level
The potential of mistakenly refuting the null hypothesis during a statistical inquiry, typically shown by the alpha symbol.
Significance Level
The threshold used to determine the probability of rejecting the null hypothesis, often denoted by alpha (\(\alpha\)).
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